I think they want to expunge groups because a monoculture is easier to control. If everyone fits into a couple of narrow boxes that all speak the same language, fulfill the same roles, have the same hard limits on expression and are all able-bodied, mentally tuned to function as desirable cogs in a machine you get an easily exploitable force. It's why they want all costs of maintenance and risk borne by the individual and more specifically the family unit which has the power to ostricize and disenfranchise on a micro scale. Pluralistic societies mean that the individual is supported by a culture of acceptance and those groups all run off of different rules which make demands of society. They want a society that makes very few demands but feels catered to thus earning higher levels of compliance.